No matter what i did. the ports config correct. but in computers i can not see the Nas Navigator outside from network on my home. then what i need to do? I want to open the Nas Navigator on another network (WAN or WIFI)

I would agree with you but he's not talking about webaccess, he's trying to get NAS Navigator to see it. That will never work without both the computer and the NAS being on the same IP subnet. The only way to accomplish this would be to set up a VPN.

I haven't used a commercial VPN but I'm pretty sure that won't work for this. It needs to be a VPN set up at the site, in this case the house. If your router has VPN functionality you can use that, otherwise you'll need something to be a VPN server at the house.

Alternatively, you could use webaccess if you just want to be able to access a specific share/shares remotely.

I'd just like to reiterate, this is not due to something that Buffalo does specifically. The protocols used for basic network file shares are not routable. I can't access a shared folder on a Windows system over the internet without a VPN to get them both on the same IP subnet either. This is the way networking works. It's the reason that standards like FTP exist, to move files to and from remote locations.

If the OP is looking for Navigator access, I have used RealVNC remotely. It's not the most secure, but what do you expect for free. You have to leave one computer on the same LAN as the NAS to act as the VNC server. You take control of that desktop and use Navigator from there. I don't recommend using Navigator remotely, though.